Browsing by Author "Ergun, Yasar"

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Antibiotic Susceptibility and Molecular Identification of Antibiotic Resistance Genes of Staphylococci Isolated From Bovine Mastitis in Algeria
(Kafkas Univ, veteriner Fakultesi dergisi, 2015) Saidi, Radhwane; Cantekin, Zafer; Khelef, Djamel; Ergun, Yasar; Solmaz, Hasan; Kaidi, Rachid
The study aimed to investigate the phenotypic and genotypic identification of in vitro antimicrobial susceptibility of 21 Staphylococci (10 Staphylococcus aureus and 11 Coagulase Negative Staphylococci) isolated from bovine mastitis to 12 antimicrobial drugs frequently using in veterinary medicine in Algeria. Isolates of staphylococci from bovine mastitis were tested for antibiotics with disc-diffusion method according to the National Committee for Clinical Laboratory Standards guidelines in the Mueller-Hinton agar, and resistant genes mecA, blaZ, aac-aph, ermA, ermC, tetK and tetM were detected by PCR. Staphylococci isolates showed high resistance to penicillin (95.23%), oxacillin (80.95%), clindamycine (80.95%), and erythromycin (76.19%) but, no resistance in all these strains was detected for gentamicin. Among 21 isolates of Staphylococci, 20 were found to be methicillin and multidrug resistant. Multidrug resistant strains exhibited several antibiogram patterns (antibiotic I to XIII). The distribution of antibiotic-resistant genes was mecA (100%) and tetM (100) followed by blaZ (42.85%). In the present study, the significant determination was the high prevalence of methicillin-resistant Staphylococci, which were resistant to multiple antibiotics. The finding of methicillin-resistant staphylococci from bovine mastitis is the first report in Algeria and revealed the status of resistant isolates in herd that might be helpful in treatment, controlling of resistant strains and for deciding culling of cows.
Comparison of Pcr and Culture Methods for Diagnosis of Subclinical Mastitis in Dairy Cattle
(Kafkas Univ, veteriner Fakultesi dergisi, 2015) Cantekin, Zafer; Ergun, Yasar; Dogruer, Gokhan; Saribay, Mustafa Kemal; Solmaz, Hasan
Bovine mastitis is the greatest source of economic loss in the dairy industry. Rapid and definitive detection of causative agent is very important for treatment and control of the disease. The aim of this study was to compare culture and polymerase chain reaction techniques for diagnosis of agents in subclinical bovine mastitis. For this purpose, after conducting the California Mastitis Test on 540 cows, 79 milk samples were analysed by the classical culture method and simplex polymerase chain reaction. Forty-three of samples were found positive by both methods, differences were found only seven samples. While coagulase negative staphylococci these seven samples were determined by culture method, coagulase negative staphylococci and S. dysgalactiae were determined together by polymerase chain reaction. The results of this study indicate that the polymerase chain reaction is more sensitive than culture method and could detect pathogens at the species level within a few hours from directly milk samples. Rapid and relieable molecular techniques can be useful method in farm level detection for fast decision about the culling or treatment.
Pcr Assay With Host Specific Internal Control for Staphylococcus Aureus From Bovine Milk Samples
(Univ Sv Kiril & Metodij Skopje, Fak veterinarna Medicina, 2015) Cantekin, Zafer; Ergun, Yasar; Solmaz, Hasan; Ozmen, Gamze Ozge; Demir, Melek; Saidi, Radhwane
Staphylococcus aureus is considered as one of the most important and common pathogens of bovine mastitis. Polymerase Chain Reaction is frequently proposed in the diagnosis of S. aureus directly from milk samples instead of classical culture. However, false-negative results may occur in the polymerase chain reaction analysis performed directly from clinical material. For the purpose of disclosing the false negative results, the use of internal amplification controls can be beneficial. Therefore, in this study a new polymerase chain reaction technique with host specific internal amplification control was developed by optimizing S. aureus-specific primers in combination with bovine specific primers. The effectiveness of the developed technique in this study was attempted in milk samples from bovine subclinical mastitis. This technique has the potential to detect S. aureus from bovine milk samples or dairy products.
Presence of Antibiotic Resistance Genes in Staphylococci Isolated From Bovine Subclinical Mastitis
(Sivar-soc Italiana veterinari Animali Reddito, 2024) Cantekin, Zafer; Ozmen, Gamze Ozge; Demir, Melek; Er, Zeynep Yilmaz; Gurturk, Kemal; Solmaz, Hasan; Ergun, Yasar
The prevalence of antibiotic resistance increases rapidly worldwide, and the primary culprit is represented by their widespread use. Subclinical mastitis is the leading cause of most antibiotic treatment, representing also one of the significant problems of bovine herd management. One of the main causes of subclinical mastitis is Staphylococcus aureus. Therefore, the determination of antibiotic resistance against Staphylococcus aureus is an essential step in the treatment of subclinical mastitis. The aim of this study was to identify antibiotic resistance genes in staphylococci obtained from cases of bovine subclinical mastitis in three provinces and the relationship between antibiotic resistance and ease of antibiotic availability (Burdur, Hatay and Van) in Turkey. In total, 283 isolates (Burdur, n = 36; Hatay, n = 47; Van, n = 200 isolates) were studied. The isolates were first identified as Staphylococcus aureus and/or non-aureus staphylococci (NAS) by conventional phenotypic methods, and the species was then confirmed by a multiplex polymerase chain reaction (PCR). A simplex PCR assay was performed to detect antibiotic resistance genes (mecA, mecC, aacA-aphD, ermA, ermB, ermC, tetK, tetM and blaZ). Among the isolates from all three provinces, the blaZ gene was the most prevalent antibiotic resistance gene, present in 43 out of 156 (28%) NAS isolates, 27 out of 127 (21%) S. aureus isolates and 25% of all the isolates. In contrast, tetM was the most prevalent gene in the Hatay isolates, detected in 64% of all isolates. The mecA-gene was present in 10% of the NAS, and in 3% of the S. aureus isolates. The mecC and ermA genes were not detected in any of the isolates. This shows that antimicrobial resistance, as determined by PCR, is common in Staphylococcus isolates from mastitis in Turkey, and warrants systematic treatment protocols as well as the implementation of preventative strategies to reduce antimicrobial usage.